Posted: 19/05/2015 at 00:58
I could try to help with information about the course, though.
I would also suggest having an extra layer to put on as you go into the night, and even a hat and gloves. The Downs seem to be very cold at night, in August anyway, and you're generally not moving as quickly.
You'd probably get away with road shoes if it's dry, although there are boggy bits in places. A word of warning: if it is wet any exposed chalky surfaces are very slippery, lethal to run on.
There isn't much scope for getting lost as long as you are following the signposts with white acorns on and not the ones indicating public footpaths, permissive paths, bridleways, byways open to all traffic, etc, which unfortunately all look the same after dark ...